In 2002 the European Union (EU) introduced the Directive on Privacy and Electronic Communications. Article 13 of the Directive prohibits the use of personal email addresses for marketing purposes. The Directive establishes the opt-in regime, where unsolicited emails may be sent only with prior agreement of the recipient; this does not apply to business email addresses.
Address subscribers by name. Personalized emails are more successful. Buffer also suggests to personalize your emails based on need by sending emails that meet different user expectations. This makes them more targeted and more likely to be successful. Some studies show that educating and segmenting your audience will boost your click through rate on emails by up to 50%.